The real PPR pipe is not only a PP-R material, but a PP-B material to produce a cold water pipe and a PP-R material to produce a hot water pipe. The Vicat softening temperature of the PPR tube is above 130 °C. It can be used in normal households without obvious bending deformation. You can rest assured that it can be used for a long time. Therefore, hot water pipes must be produced using PPR pipe materials. First, the characteristics of the PPR tube 1. Non-toxic and hygienic. The raw material molecules of PPR pipes are only carbon and hydrogen, and there are no harmful and toxic elements. They are not only used for hot and cold water pipes, but also for pure drinking water systems. 2, better heat resistance. The Vicat softening point of the PPR tube was 131.5 °C. The maximum working temperature can reach 95 °C, which can meet the requirements of the hot water system in the building water supply and drainage regulations. 3, insulation and energy saving. The thermal conductivity of the PPR tube is 0.21 w/mk, which is only 1/200 of the steel pipe. 4, long service life. The PPR tube has a service life of more than 50 years at a working temperature of 70 ° C and a working pressure (PN) of 1.OMPa; the service life at room temperature (20 ° C) can reach more than 100 years. 5. The materials can be recycled. After the PPR waste is cleaned and crushed, it is recycled and used in the production of pipes and fittings. The amount of recycled materials does not exceed 10% of the total amount, and does not affect the quality of the product. 6, easy to install. The PP pipe has good welding performance. The pipe and pipe fittings can be connected by hot melt and electrofusion, and the installation is convenient. The strength of the joint is greater than the strength of the pipe itself. Second, the specifications of the PPR tube Specifications are divided into 20-160mm: but the most commonly used specifications are 20-32mm 1, 20 × 2.3 commonly known as 4 points: thickness is 2.3mm, 2.8mm, outer diameter is 20, there is also a 3.4mm mark on the wall is red line. 2, 25 × 3.5 commonly known as 6 in charge: thickness of 3.5mm, outer diameter of 25, tube wall and 4.2mm and 2.8mm 3, PP pipe cold water pipe and hot water pipe: 25 × 2.8 for the cold water pipe, marked with blue line; 25 × 42 for the hot water pipe, marked with red line Third, PPR pipe application matters 1. PP-R pipe is lower in hardness and rigidity than metal pipe, and should be protected during handling and construction to avoid mechanical damage caused by improper external force. After the dark application, the position of the pipeline should be marked to avoid damage to the pipeline due to the secondary decoration. 2. PP-R tube has a certain low temperature brittleness below 5 °C. Be careful when constructing in winter. Cut the tube slowly with a sharp cutter. The installed pipelines should not be stressed or tapped, and if necessary, cover the parts that are vulnerable to external forces. 3, PP-R tube is prone to aging degradation by ultraviolet radiation for a long time, and it must be wrapped in a dark protective layer when installed outdoors or in direct sunlight. 4. In addition to the mechanical connection of threaded inserts or flanges, the PP-R pipe should be connected with metal pipe or water machine, and the other should be hot-melt joint to make the pipe integrated without leakage. 5. The coefficient of linear expansion of PP-R pipe is large (0.15mm/m °C). Technical measures to prevent pipe expansion and deformation must be taken when installing or not directly burying the dark pipe. 6. After the pipeline is installed, it must be tested before sealing (direct burial) and covering the decorative layer (not directly buried and dark). The pressure test pressure of the cold water pipe is 1.5 times of the working pressure of the system, but not less than 10 MPa; the test pressure of the hot water pipe is twice the working pressure, but not less than 1.5 MPa. Pressure test time and method technical regulations. 7. When PP-R pipe is used or not directly buried in the dark pipe, the branch and hanger must be installed as required. Uvc Panel Lights,Uvc Led Panel Lamp,Uvc Recessed Led Panel Lamp,Uvc Recessed Led Panel Light Top Lighting International (HK) Co., Limited , https://www.topled-group.com
PPR pipe specifications and construction precautions